Study on the synthesis of clay-based titanium silicalite-1 catalytic composite
Study on the synthesis of clay-based titanium silicalite-1 catalytic composite
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DOI：
10.1021/ie9002798
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发表时间：
2009-04
影响因子：
4.2
通讯作者：
Alex C. K. Yip;F. L. Lam;Xijun Hu;Ping Li;W. Yuan
中科院分区：
文献类型：
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作者：
Alex C. K. Yip;F. L. Lam;Xijun Hu;Ping Li;W. Yuan
使用水热处理以在膨润土载体上结晶TS-1（300 - 400 nm）来合成粘土基钛硅沸石-1（TS-1）催化复合材料。膨润土的存在有利于支撑生长，这归因于基质的吸附性质增强了与溶解的结晶物种的相互作用。在钛掺入之前，膨润土载体上的快速结晶导致硅沸石-1的形成。的FT-IR光谱研究表明，Si缺陷的网站是在Ti键合的确切位置。在粘土基TS-1中，Ti被证实以Si−O−Ti桥的形式存在，而不是Ti O基团。研究了合成温度、时间、水与二氧化硅的摩尔比、起始凝胶中Ti和TPAOH的浓度对粘土基TS-1复合材料性能的影响。粘土基TS-1复合材料除了具有高而稳定的催化活性外，还具有良好的沉降性能。
A clay-based titanium silicalite-1 (TS-1) catalytic composite was synthesized using hydrothermal treatment to crystallize TS-1 (300−400 nm) on a bentonite support. The presence of bentonite is favorable to supported growth attributed to the adsorption properties of the substrate which enhanced the interaction with the dissolved crystallizing species. The rapid crystallization on the bentonite support caused formation of silicalite-1 prior to Ti incorporation. An FT-IR spectroscopic study revealed that the Si defective sites were the exact location at which Ti was bonded. The Ti has been confirmed to exist in the form of a Si−O−Ti bridge instead of a Ti═O group in the clay-based TS-1. The influence of the synthesis temperature, duration, H2O to SiO2 molar ratio, and Ti and TPAOH concentrations in the starting gel on the characteristics of the clay-based TS-1 composite were also studied. In addition to the high and stable catalytic activity, the excellent settling efficiency of the clay-based TS-1 composite...